Dynamical excitation and anelastic relaxation of ferroelastic domain walls in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LaAlO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Harrison, R. J.; Redfern, Simon A. T.; Salje, Ekhard K. H.

doi:10.1103/physrevb.69.144101

Cited by 144 publications

(175 citation statements)

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“…The probably most common doping in perovskite oxides relates to oxygen vacancies. Significant pinning of the movement of twin boundaries by oxygen vacancies occurs in polycrystalline Ca 1Àx Sr x TiO 3 and LaAlO 3 single crystals [55,56]. The activation energy for domain wall motion (determined from the temperature and frequency dependence of the storage modulus and loss tangent), is of the order of 0.88-1.09 eV, which is comparable with the activation energy for O-atom diffusion through a perovskite structure.…”

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confidence: 50%

Domain boundary engineering

2009

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supporting

confidence: 50%

Domain boundary engineering

2009

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“…However, the velocity of sideways movement of the domain walls, B10-100 nm s À 1 , is much lower than that of the needle point in our study. A previous study showed that in ferroelastic materials, needle domains can move even under small external forces and/or at low temperature while larger forces and/or at higher temperatures are required to cause additional sideways movement of domain walls 32 . These differences in velocity and threshold field between needle point motion and sideways movement are probably beacuse of the fact that the needle point has a high-energy domain front owing to the deviation from the regular polar axis in the polarization vector, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Ferroelastic domain switching dynamics under electrical and mechanical excitations

et al. 2014

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In thin film ferroelectric devices, switching of ferroelastic domains can significantly enhance electromechanical response. Previous studies have shown disagreement regarding the mobility or immobility of ferroelastic domain walls, indicating that switching behaviour strongly depends on specific microstructures in ferroelectric systems. Here we study the switching dynamics of individual ferroelastic domains in thin Pb(Zr 0.2 ,Ti 0.8 )O 3 films under electrical and mechanical excitations by using in situ transmission electron microscopy and phase-field modelling. We find that ferroelastic domains can be effectively and permanently stabilized by dislocations at the substrate interface while similar domains at free surfaces without pinning dislocations can be removed by either electric or stress fields. For both electrical and mechanical switching, ferroelastic switching is found to occur most readily at the highly active needle points in ferroelastic domains. Our results provide new insights into the understanding of polarization switching dynamics as well as the engineering of ferroelectric devices.

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“…In this case, internal interfaces such as twin boundaries move with little restoring forces through samples when external stresses are applied (Lee et al 2006). The effective elastic bulk and shear moduli are then completely dominated by such moving interfaces and reductions, in stiffness by one order of magnitude, are common (Kityk et al 2000;Harrison et al 2004). The elastic moduli cease to be materials parameters and largely depend on the mobility of interfaces, boundary conditions and the internal structures of interfaces.…”

Section: Introductionmentioning

confidence: 99%

(An)elastic softening from static grain boundaries and possible effects on seismic wave propagation

Salje

2008

Phys Chem Minerals

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It is argued that low-frequency wave propagation shows, in most cases, very little dependence on the atomistic properties of grain boundaries if the thickness of the grain boundary is atomistically thin while the grain size is in the mm region. Large effects do exist for specific textures (e.g. the brick wall texture). The essential ingredient for the assessment of an-elastic and non-linear elastic features of seismic wave propagation does not primarily depend on the structural properties of immobile, dry grain boundaries but on the way the grain boundary properties can be related to those of macroscopic mineral assemblies. Specific results for coated sphere textures are derived using Hashin-Shtrikman theory. An-elastic seismic features are more likely to be related to the mobility of boundaries and dislocations which can be attached to the grain boundaries, or bulk-related defect structures, rather than the intrinsic materials properties of the grain boundaries.

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Dynamical excitation and anelastic relaxation of ferroelastic domain walls inLaAlO3

Cited by 144 publications

References 15 publications

Domain boundary engineering

Domain boundary engineering

Ferroelastic domain switching dynamics under electrical and mechanical excitations

(An)elastic softening from static grain boundaries and possible effects on seismic wave propagation

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